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X-ray Detector on Plastic Delivers Medical Imaging Performance - Researchers from Holst Centre and imec have demonstrated the first ever X-ray detector produced on a plastic substrate that is capable of medical-grade performance - /
X-ray Detector on Plastic Delivers Medical Imaging Performance


NewswireToday - /newswire/ - Eindhoven, Netherlands, 2014/04/16 - Researchers from Holst Centre and imec have demonstrated the first ever X-ray detector produced on a plastic substrate that is capable of medical-grade performance - /

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The proof-of-concept device delivers high-resolution, dynamic images at 25 frames per second (fps) and 200 pixels per inch (ppi) with high contrast using medical-level X-ray doses.

Digital X-ray systems offer a number of benefits over older, analog systems. Images are available faster, are easier to share and can be achieved using less radiation. However, today’s digital X-ray sensors are still produced on large glass substrates, making them heavy, difficult to transport and prone to breakages.

In 2012, the team demonstrated the world’s first complete X-ray detector produced on a thin plastic substrate. An indirect flat panel detector (FPD), it combined a standard scintillator with a novel organic photodiode layer and organic thin-film transistor (TFT) backplane. By using solution-processed organic semiconductor rather than the usual amorphous silicon, the team reduced process temperatures to be compatible with plastic film substrates. They also eliminated a number of costly lithography steps, opening the door to lower production costs.

Now, the same team has delivered a major breakthrough in device performance. It has reduced the photodiode leakage current (the output from the photodiodes at zero light) by a factor of 10,000, down to 10-7 mA/cm2, bringing it well within the requirements for medical detectors. This improves the signal-to-noise ratio, and hence image quality at low radiation dose. At the same time, oxide transistors are used instead of organic transistors. The charge carrier mobility in the metal-oxide TFTs is 10-50 times higher than with amorphous silicon and organic transistors, enabling faster image acquisition.

These advances were integrated into a high-aperture QQVGA (160 x 120 pixels) detector plate with a high resolution of 200-ppi. This plate was integrated with off-board electronics consisting of components that are currently used for medical application, and no modifications needed to be made.

“X-ray detectors on plastic could lead to lighter, more robust and less expensive X-ray systems that are easier to move around the hospital. Two years ago, we were the first to show such devices were technically possible. And now we have shown they can deliver the performance necessary for medical use. Our next goal is to scale up the technology and produce a full-size 30 cm by 30 cm demonstrator module for medical applications,” said Holst Centre’s Gerwin Gelinck, who headed up the research team.

This work was done in collaboration with Philips Research and Philips Healthcare.

About Holst Centre
Holst Centre ( is an independent open-innovation R&D center that develops generic technologies for wireless autonomous sensor technologies and for flexible electronics. A key feature of Holst Centre is its partnership model with industry and academia around shared roadmaps and programs. It is this kind of cross-fertilization that enables Holst Centre to tune its scientific strategy to industrial needs.

Holst Centre was set up in 2005 by imec (Flanders, Belgium) and TNO (The Netherlands) with support from the Dutch Ministry of Economic Affairs and the Government of Flanders. It is named after Gilles Holst, a Dutch pioneer in Research and Development and first director of Philips Research.

Located on High Tech Campus Eindhoven, Holst Centre benefits from, and contributes to, the state-of-the-art on-site facilities. Holst Centre has over 180 employees from about 28 nationalities and a commitment from close to 40 industrial partners.

About imec
Imec ( performs world-leading research in nanoelectronics. Imec leverages its scientific knowledge with the innovative power of its global partnerships in ICT, healthcare and energy. Imec delivers industry-relevant technology solutions. In a unique high-tech environment, its international top talent is committed to providing the building blocks for a better life in a sustainable society. Imec is headquartered in Leuven, Belgium, and has offices in Belgium, the Netherlands, Taiwan, US, China, India and Japan. Its staff of over 2,080 people includes more than 670 industrial residents and guest researchers. In 2012, imec's revenue (P&L) totaled 320 million euro.

Imec is a registered trademark for the activities of IMEC International (a legal entity set up under Belgian law as a "stichting van openbaar nut”), imec Belgium (IMEC vzw supported by the Flemish Government), imec the Netherlands (Stichting IMEC Nederland, part of Holst Centre which is supported by the Dutch Government), imec Taiwan (IMEC Taiwan Co.) and imec China (IMEC Microelectronics (Shanghai) Co. Ltd.) and imec India (Imec India Private Limited).

Contact: Steffie van de Vorstenbosch - Communication Officer
E: steffie.vandevorstenbosch[.] - T : +31 40 40 20 650

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X-ray Detector on Plastic Delivers Medical Imaging Performance

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Imec | Holst Centre
Publisher Contact: Katrien Marent - 
+3216 281 880 Katrien.Marent[.]
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